The rollback endpoint took a deployment ID and did nothing with it

This is a submission for DEV's Summer Bug Smash: Clear the Lineup powered by Sentry . Project Overview Staxa is a multi-tenant deployment platform I am building solo under Stackforge Labs. The backend is a single Go binary ( staxad ) using the chi router, with about 60 API endpoints, running on K3s on a Hetzner CAX21 ARM64 server that costs around $11/month. Each tenant gets an isolated Kubernetes namespace with their own app container, a PostgreSQL 16 or MySQL 8 database, a subdomain with automatic SSL, and resource quotas. Container builds run through Buildah, and the frontend is Next.js (App Router) with shadcn/ui and Clerk for auth. Bug Fix or Performance Improvement The symptom: POST /api/v1/tenants/{id}/deployments/{depId}/rollback accepted a deployment ID in the URL path and then completely ignored it. Whatever version you asked for, you got the most recent successful deployment instead. The route was wired up correctly in internal/api/router.go:149 : r . Post ( "/tenants/{id}/deployments/{depId}/rollback" , srv . handleRollbackDeployment ) But handleRollbackDeployment never called chi.URLParam(r, "depId") . It read {id} for the tenant and stopped there. How I found it: I was auditing my published API docs against the actual handlers, endpoint by endpoint. When I got to the rollback entry I went to write down what {depId} did, went to the handler to confirm, and found nothing reading it. The docs described an ID that the code never looked at. The worst part is that it returned 202 Accepted and then performed a real, successful rollback. Just not the one you asked for. There was no error to notice, no failed request in any log. The frontend had been passing the deployment ID into the URL since it was written ( src/lib/api.ts ), so the UI always believed the parameter was honored. Root cause: the handler created a rollback deployment row with no reference to any target, and the worker independently decided what to restore. In internal/worker/pipeline.go , runRo